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Multi-ram drill rig and method of operation

Inactive Publication Date: 2012-03-15
STRADA DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]The one or more rams are selectively actuated to increase by one the number of rams applying force to the travelling sheave trolley.

Problems solved by technology

Such a drill rig may require a power pack providing approximately 400 hp and consume in the order of 960 L of fuel per day.

Method used

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  • Multi-ram drill rig and method of operation
  • Multi-ram drill rig and method of operation
  • Multi-ram drill rig and method of operation

Examples

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Embodiment Construction

[0033]An embodiment of the present invention provides a drill rig having a plurality of rams that can be selectively actuated to progressively increase the number of rams applying hold back and pull down to a drill head and associated drill bit rotated by the drill head in a manner where force is applied in balanced or symmetrical manner. For example in one embodiment the drill rig may comprise three rams which can apply hold back and pull down to a drill bit coupled to a drill head. The rams can be progressively actuated so that initially one ram is activated, then two rams, and then all three. The rams are arranged so that when they are progressively actuated, the force of the rams is applied in a balanced or symmetrical manner. This is facilitated by the use of a travelling sheave trolley which is connected between the rams and the drill head. The trolley and the drill head are coupled together in a manner so that movement of the travelling sheave trolley in one direction causes ...

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PUM

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Abstract

A drill rig (10) comprises a tower (12) and a drill head (14) that is able to travel linearly up and down the tower (12). The drill head (14) provides torque to a drill string (16) attached to the drill head (14) ad thus to a drill bit (18) coupled to a distal end of the drill string (16). The drill head (14) is traversed along the tower (12) by a plurality of rams (22a, 22b) and (22c) (hereinafter referred to in general as “rams 22”). The rams (22) provided hold back and pull down for the drill bit (18) via the drill head (14). The rams (22) are selectively operable to enable the hold back and pull down applied to the drill bit to be selectively varied. Thus for example a first of the rams (22a) is selected to operate when drilling to a first depth, then the rams (22b) and (22c) are selected to operate when drilling to a second greater depth; and finally all three rams (22a, 22b) and (22c) are selected to operate when drilling to a third greater depth.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a multi-ram drill rig and a method of operating such a drill rig.BACKGROUND OF THE INVENTION[0002]A typical drill rig comprises a tower which supports a drill head that in turn rotates a drill string. The drill head can be slid up and down the tower for the purposes of tripping a drill into and out of a hole. The motion of the drill head is controlled by one or more hydraulic rams. The size of the rams used is dependent upon the maximum drilling depth of the drill rig. For relatively shallow holes for example up to 800 m, a drill rig may comprise two rams each having 120 mm (approximate 5″) diameter. Such a drill rig may require a power pack providing approximately 400 hp and consume in the order of 960 L of fuel per day. In comparison, a drill rig designed to drill to a depth of say 2000 m may incorporate two rams each of 300 mm (12″) and require a 2500 hp power pack and consuming approximately 8400 L of fuel per day. The...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B15/00
CPCE21B19/086E21B19/084E21B19/02
Inventor STRANGE, WARREN
Owner STRADA DESIGN